Oil-well casing head



M rch 29 1927.

a c c HOSMER OIL WELL'CASING HEAD Filed Dec. 13, 1923 Q i w casing,which hea Patented Mar. 29, 1927.

' C. 08138, 0! HUNTINGTON BEACH, CALIFOBNIL ona wnm. ca'sme mum.

Application I101! mumm- 18, 1923. Serial Io. 880,378.

My invention relates generally to oil well appliances, and moreparticularly to a bowl or cylindrical head t at is adapted to be appliedto the upper end of a well tube or is adapted to receive casing headpackings of the general type (118- closed in my -co-pending a plicatlonsfiled September 15, 1922, Serial 0. 588,391, and Au t 30, 1923,-SerialNo. 660,145.

he principal objects of my present invention are to generally im roveupon and sunlify' the construction 0 the casing heads or Bowls now ingeneral use and to prov de a bowl or cylindrical head that ispractically universal in its use, inasmuch as it may be used to serve anumber of purposes, for mstance as a receptacle for t e unitary packingmembers disclosed in my aforesaid co pending atent applicationsas areceptacle for a spi er that may be mzimpulated so as to bear on top ofthe packing element and thereby produce a tightly packed joint betweehthe tube and the casing head or bowl without utilizing the weight of thetubing; for the purpose of permitting a circulation of mud or waterunder pressure and likewise to permit the cementing of a well throughthe tubing, which latter may be moved vertically for'the length of afull joint or section so as to in thecement. 1 r

With the foregoing and other objects in view, my invention consists inthe features of construction and combination and arprevent settingrangement of parts hereinafter more fully position by a spider that isinserted in the top of the head;

Figure 2 1s a vertical section taken through the center of the head andshowing the packing structure retained in packing position therein bythe weight of t e-drill t b Fi 3 is a horizontalsection taken on the me3-3 of Figure 1;

Figure 4 is a perspective view of a tube engaging slip that is usedin'connection with which structure has contra y-arranged'.

my improved casing head;

Figure 5 is a side elevational view of the packing structure used inmyim roved head,

' ring 17, preferably ofrubber.

, inclin '24, and extending .inc

tube receiving opening closed by a blind nipple, thereby ena ling saidpacking structure to be used as a plug in the upper portion of the casinhead while cement is being pumped t rough openings in the lower portionof said head.

than the internal diameter of the lower portion of said bowl or head,and formed between the portions -of different diameters is an interna lyarranged inclined shoulder 13 which serves as a bearing or seat for thecorrespondingly ta ered lower portion 14 of the packing unit. ably of atype disclosed in my above mentioned copending applications, and itincludes upper and lower split metal'rings 15 and 16 between which isarranged an elastic Formed axially through this packing unit is anopening 18 which receives the drill tube T.

The upper portion of the wall of head or bowl 10 is provided with anexternal thread 19 and with an internal thread 20, the latter beingadapted to receive a' corresponding thread that is formed externally-0nthe lower portion of a spider 21, the external thread on a' cap or afurther pipe connection for the casing head. This spider. which is inthe form of a short tube, is provided in its upper rtion with aninternally-arranged seat or shoulder 22 for a pair of drill tubeengaging slips 23. The bodies of these slips are of the usual form, buttheir upper ends are provided with beveled faces into the bodies of saidinwardly and downwardly from those faces '24 are apertures 25 whichreceive the ends of looped straps 26 which sli serve as handles forlifting and manipulat- -or the like, and by this arrangement of the hispacking unit is preferby t-ltilizing looped handles they will not bebroken ofl' in the event that an elevator or other extraneous objectmoves downward into position so as to rest on top of the slips.

Formed through the upper portion of the Wall of the spider 21 areapertures 27 that are adapted to receive a spanner wrench for the end ofa bar that may be utilized for screwing-said spider into the upper endof the casing head or bowl or out of the ,samel 1 Formed through thelower portion of the wall of the head or bowl 10 and below shoulder 13are threaded apertures in which may be seated short tubular members ornipples 28, thus enabling mud or water to be circulated through the headand the casing. to which it is applied and likewiseto permit cement tobe pumped into the casing.

In Figure 1 the packing unit comprising the parts 15, 16 and 17, isshown as being maintained in packingxppsition by the spider 21 and toproduce a leak-proof joint between the flexible packing element 17 andthe casing head or bowl and the tube T spider 21 is screwed into theupper end of the casing head 12, its lower end engages the upper faceof. split ring 15 and forces the parts of the packing element together,which action necessarily compresses member 17 and forces its inner andouter faces into intimate contact with tube T and the wall of head orbowl 10. Where this method'of packing is carried out the tube T issupported by means of the slips 23 which are positioned in the upperportion of spider 21.

Where the packing action is accomplished the weight of the tubing, asillustrated in Figure 2, the slips 23 are removed from the tube-and thelatter is lowered until one of the collars or nipples, such as X, restsdirectly on top of the upper metal ring of the packing element. Thus theweight of the supported tubing acts through the upper ring of thepacking element to compress the intermediate ring and for e its innerand outer faces into immedipressure produced as a result of screwingdown the nipple21. With the casing head thus plugged, cement may bepumped into the casing through the short tubes or nip- 7 ples 28.

In so far as I amaware, I am the first to produce a casing head or bowl,that is constructed so that it may, in combination with a packing memberand spider, be used for packing ofi the head end of the casing, eitherin the size, form and construction of my improved casing head or bowlmay be made without departing from the spirit of my invention, the scopeof which is set forth in the appended claims.

I claim as my invention:

1. The combination with a well casing, of

It will be understood that minor changes a head comprising asubstantially straight cylindrical body, the lower portion of the .wallthereof being externally threaded inorder to be screwed into the upperend .of the well casing, the upper portion of the straight cylindricalwall of said head bein internally and externally threaded, a taper seatformed on the interior of said head intermediate its ends, and said headbeing provided with openings in its wall below said tapered seat, apacking element adapted to rest on said tapered seat and a spideradapted to be screwed into the upper end of said lead and to bear on theupper end of the packing element within said head.

2. An oil well casing head comprising a tubular body, the upper portionofthe wall thereof being internally threaded, a tapered seat formedwithin said tubular body intermediate its ends which seat is adapted toreceive the tapered lower ortion of a packing element and a spi oradapted to be screwed into the internally threaded upper end of saidtubular body to bear on the upper end of the packing element positionedwithin the head.

3. An oil well casing head comprising a tubular body, the upper portionof the wall thereof being internally threaded, a tapered seat formedwithin said tubular body 1ntermediate its ends, which seat is adapted toreceive the tapered lower portion of a packing element,'a spider adaptedto be screwed into the internally threaded upper end of said tubularbody to bear on the upper end of the packing element positioned withinthe head and the upper portion of said spider being provided with aninternall arranged tapere seat for the reception 0 tube supportingslips,

4. An oi well casing head com rising a tubular body, the upper portion 0the wall thereof being internally threaded,'a tapered seat formed withinsaid tubular body intermediate its ends, which seat is adapted toreceive the tapered lower-portion of a packing element, a spider ada tedto be screwed into the internally threa ed upper end of said tubularbody to bear on the upper end of the acking element positioned withinthe head and there being openings formed through 'the wall of thetubular memberbelow the ta red seat therein.

5. An 011 well casing head eomprising'a tubular body, the chamber withinwhich is adapted to receive and support 'a packing element, the upperportion of said tubular body being internally threaded .nd a spider.havmg its lower portion screw seated in the 10 internally threaded u rrtion of the tu- Pg P bular body and adapte to engage the upper end ofthe packing element positioned therein.

} Intestimo ny whereof I afiiir my signature.

. CHESTER c. HOSMER.

